/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.util.net;

import java.net.Socket;
import org.apache.tomcat.util.threads.ThreadPoolRunnable;

/*
 * I switched the threading model here.
 *
 * We used to have a "listener" thread and a "connection"
 * thread, this results in code simplicity but also a needless
 * thread switch.
 *
 * Instead I am now using a pool of threads, all the threads are
 * simmetric in their execution and no thread switch is needed.
 */
class LeaderFollowerWorkerThread implements ThreadPoolRunnable {
	/*
	 * This is not a normal Runnable - it gets attached to an existing thread,
	 * runs and when run() ends - the thread keeps running.
	 * 
	 * It's better to keep the name ThreadPoolRunnable - avoid confusion. We
	 * also want to use per/thread data and avoid sync wherever possible.
	 */
	PoolTcpEndpoint endpoint;

	public LeaderFollowerWorkerThread(PoolTcpEndpoint endpoint) {
		this.endpoint = endpoint;
	}

	public Object[] getInitData() {
		// no synchronization overhead, but 2 array access
		Object obj[] = new Object[2];
		obj[1] = endpoint.getConnectionHandler().init();
		obj[0] = new TcpConnection();
		return obj;
	}

	public void runIt(Object perThrData[]) {

		// Create per-thread cache
		if (endpoint.isRunning()) {

			// Loop if endpoint is paused
			while (endpoint.isPaused()) {
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					// Ignore
				}
			}

			// Accept a new connection
			Socket s = null;
			try {
				s = endpoint.acceptSocket();
			} finally {
				// Continue accepting on another thread...
				if (endpoint.isRunning()) {
					endpoint.tp.runIt(this);
				}
			}

			// Process the connection
			if (null != s) {
				endpoint.processSocket(s, (TcpConnection) perThrData[0],
						(Object[]) perThrData[1]);
			}

		}
	}

}
